Nispira 3500 Filter Replacement Compatible with Air Doct AD Series 3500 & 3500i Air Purifier Models, 3-Stage HEPA, Activated Carbon & Pre-Filter Set, 2 Set

["Designed for compatibility with Air Doct AD series 3500, and 3500i air purifier models, providing a secure fit and straightforward replacement.","Includes a main filter, activated carbon layers, and pre-filter layers arranged in a multi-stage configuration to support regular system operation.","Each set includes 2 main filter, 4 activated carbon filters, and 8 pre-filters. Approximate dimensions: main filter 13.4 x 16.3 x 1.4 in, carbon filter 13.4 x 16.3 x 0.9 in, pre-filter 13.4 x 16.3 x 0.1 in.","Each component is designed to fit securely within the unit, helping maintain consistent operation during routine use.","Simple replacement process with no tools required, allowing quick installation and regular maintenance.","Designed for everyday home use, this replacement set offers a convenient option for maintaining your air purifier over time."]